diff --git a/src/main/resources/api-definition/hs-office/hs-office-partner-schemas.yaml b/src/main/resources/api-definition/hs-office/hs-office-partner-schemas.yaml
index 6aede37b..6b044a27 100644
--- a/src/main/resources/api-definition/hs-office/hs-office-partner-schemas.yaml
+++ b/src/main/resources/api-definition/hs-office/hs-office-partner-schemas.yaml
@@ -9,6 +9,11 @@ components:
                 uuid:
                     type: string
                     format: uuid
+                debitorNumberPrefix:
+                    type: integer
+                    format: int8
+                    minimum: 10000
+                    maximum: 99999
                 person:
                     $ref: './hs-office-person-schemas.yaml#/components/schemas/HsOfficePerson'
                 contact:
@@ -86,6 +91,11 @@ components:
         HsOfficePartnerInsert:
             type: object
             properties:
+                debitorNumberPrefix:
+                    type: integer
+                    format: int8
+                    minimum: 10000
+                    maximum: 99999
                 personUuid:
                     type: string
                     format: uuid
@@ -95,6 +105,7 @@ components:
                 details:
                     $ref: '#/components/schemas/HsOfficePartnerDetailsInsert'
             required:
+                - debitorNumberPrefix
                 - personUuid
                 - contactUuid
                 - details
diff --git a/src/main/resources/db/changelog/223-hs-office-partner-rbac.sql b/src/main/resources/db/changelog/223-hs-office-partner-rbac.sql
index 32f629dc..db5db365 100644
--- a/src/main/resources/db/changelog/223-hs-office-partner-rbac.sql
+++ b/src/main/resources/db/changelog/223-hs-office-partner-rbac.sql
@@ -180,6 +180,7 @@ call generateRbacIdentityView('hs_office_partner', $idName$
 call generateRbacRestrictedView('hs_office_partner',
     '(select idName from hs_office_person_iv p where p.uuid = target.personUuid)',
     $updates$
+        debitorNumberPrefix = new.debitorNumberPrefix,
         personUuid = new.personUuid,
         contactUuid = new.contactUuid
     $updates$);
diff --git a/src/test/java/net/hostsharing/hsadminng/hs/office/partner/HsOfficePartnerControllerAcceptanceTest.java b/src/test/java/net/hostsharing/hsadminng/hs/office/partner/HsOfficePartnerControllerAcceptanceTest.java
index 053b03e1..0ac1eb2d 100644
--- a/src/test/java/net/hostsharing/hsadminng/hs/office/partner/HsOfficePartnerControllerAcceptanceTest.java
+++ b/src/test/java/net/hostsharing/hsadminng/hs/office/partner/HsOfficePartnerControllerAcceptanceTest.java
@@ -125,6 +125,7 @@ class HsOfficePartnerControllerAcceptanceTest {
                         .contentType(ContentType.JSON)
                         .body("""
                                {
+                                   "debitorNumberPrefix": "12345",
                                    "contactUuid": "%s",
                                    "personUuid": "%s",
                                    "details": {
@@ -166,6 +167,7 @@ class HsOfficePartnerControllerAcceptanceTest {
                     .contentType(ContentType.JSON)
                     .body("""
                                {
+                                   "debitorNumberPrefix": "12345",
                                    "contactUuid": "%s",
                                    "personUuid": "%s",
                                    "details": {}
@@ -193,6 +195,7 @@ class HsOfficePartnerControllerAcceptanceTest {
                     .contentType(ContentType.JSON)
                     .body("""
                                {
+                                   "debitorNumberPrefix": "12345",
                                    "contactUuid": "%s",
                                    "personUuid": "%s",
                                    "details": {}
@@ -294,6 +297,7 @@ class HsOfficePartnerControllerAcceptanceTest {
                     .contentType(ContentType.JSON)
                     .body("""
                                {
+                                   "debitorNumerPrefix": "12345",
                                    "contactUuid": "%s",
                                    "personUuid": "%s",
                                    "details": {